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UCC28070 四相交错应用

Other Parts Discussed in Thread: UCC28070

UCC28070规格书提供两片UCC28070进行并联使用的基本电路图。图中通过一个交错180°的同步信号,让两个UCC28070进行交错输出,那么问题来了!同步信号是交错180°的,UCC28070的输出也是交错180°的,那么四项中就会存在两项同时导通,两项同时关断的状态,根本达不到四相交错的目的,请问,手册18页描述的四交错是怎样的?难道不是每项90°相角么?